why was it critical for good pioneer trails going west to have a decent route through the Rocky mountains

i think i agree because it is telling you to always believe in yourself.

b) almost one million irish people died during the potato famine.

i think i will need more detail to answer if this is a specific question on a test, but technology advancements are good for many industries, such as medicine or food industries, new technology could us in medicine in ways such as new scanners to tell us more about our bodies or new cures or vaccines for diseases.